Error Accessing webservice programmatically over HTTPS.

[sathyamurthy]

I'm getting the follwoing error msg while trying to access
a web service over HTTPS."The underlying connection was
closed: Unable to connect to the remote server."
I'm trying to access the web service within the network.
So I'm not using any proxy.
Also I'm able to see the asmx file through web browser.
Any suggestion is highly appreciated.